firmware: stratix10-svc: Fix an NULL vs IS_ERR() bug in probe

The svc_create_memory_pool() function returns error pointers.  It never
returns NULL.  Fix the check.

Fixes: 7ca5ce89 ("firmware: add Intel Stratix10 service layer driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/5f9a8cb4-5a4f-460b-9cdc-2fae6c5b7922@kili.mountainSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/firmware/stratix10-svc.c

@@ -1133,8 +1133,8 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 		return ret;
 
 	genpool = svc_create_memory_pool(pdev, sh_memory);
-	if (!genpool)
-		return -ENOMEM;
+	if (IS_ERR(genpool))
+		return PTR_ERR(genpool);
 
 	/* allocate service controller and supporting channel */
 	controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL);